From 322ecbe4ac85d4d9d11f50240ef6e5291fbbf440 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Tue, 11 Sep 2012 15:49:52 +0200 Subject: console: add EHCI debug port based serial console Low level hardware interface pieces adapted from Linux. For setup information, see Linux'es Documentation/x86/earlyprintk.txt and/or http://www.coreboot.org/EHCI_Debug_Port. Signed-off-by: Jan Beulich Reviewed-by: Konrad Rzeszutek Wilk Acked-by: Keir Fraser --- docs/misc/xen-command-line.markdown | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'docs/misc') diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown index 92fa8fcd26..e70b722500 100644 --- a/docs/misc/xen-command-line.markdown +++ b/docs/misc/xen-command-line.markdown @@ -244,7 +244,7 @@ A typical setup for most situations might be `com1=115200,8n1` Specify the size of the console ring buffer. ### console -> `= List of [ vga | com1[H,L] | com2[H,L] | none ]` +> `= List of [ vga | com1[H,L] | com2[H,L] | dbgp | none ]` > Default: `console=com1,vga` @@ -260,6 +260,8 @@ the converse; transmitted and received characters will have their MSB cleared. This allows a single port to be shared by two subsystems (e.g. console and debugger). +`dbgp` indicates that Xen should use a USB debug port. + `none` indicates that Xen should not use a console. This option only makes sense on its own. @@ -352,6 +354,12 @@ combination with the `low_crashinfo` command line option. ### credit2\_load\_window\_shift > `= ` +### dbgp +> `= ehci[ | @pci:. ]` + +Specify the USB controller to use, either by instance number (when going +over the PCI busses sequentially) or by PCI device (must be on segment 0). + ### debug\_stack\_lines > `= ` -- cgit v1.2.3